docs: def chorus(self, gain_in, gain_out, decays):
          """TODO Add docstring."""
          self.command.append("chorus")
          self.command.append(gain_in)
          self.command.append(gain_out)
          for decay in decays:
              modulation = decay.pop()
              numerical = decay
              self.command.append(' '.join(map(str, numerical)) + ' -' + modulation)
          return self